As a Norse god He is immortal and omnipotent and can do anything He wants. He is the most powerfull of the Norse gods due to being the king/father and can control and manipulate the powers of his children, so they dont cause trouble which He would have to reverse. No other gods are mentioned except for those in the Norse pantheon e.g. Thor, the God of Thunder and Baldr, the God of Love, but it is pressumed that everything exists with no impossibillities.